Need some help here folks. Ct200ex with lots of mods and torque converter. Bike is fast. Pulls hard. No breaking up. It won’t rev past 5k rpms though.
Build:
196 Hisun
Head shaved .070
Ported/polished
18lb springs
32 degrees timing on 3.1lb flywheel
Billet +.020 rod
Stock piston
Mikuni vm22
Staged Header
Upgraded msd wire
3910x plug
Cl1 cam
Rider+bike=260lbs
Tav 30 series, 6” driver with white springs, 3100 rpm engagement
19” tires.
Gearing- 50/8, 50/9, 72/10
I ran the engine first with 50/8. Driven on middle setting with green spring. Bike hit 41.x mph. Rpms were about 4800. I thought maybe I needed more gear to gain rpms. Switched to 72/10. Bike hit 5100 rpms, still showing 41mph, and did NOT feel as peppy. Switched to 3rd hole on driven...still same. Switched to 50/9 on 3rd hole. Bike felt peppy like it did on 50/8 but still 41mph.
Tried moving main jet up and down. Still 41-42mph.
Bike isles great, mid range is great, top end doesn’t break up and it isn’t excessively popping. Seems good.
What is preventing the bike from going faster? I know the cam is small and I have a lager 265 cam on order, but I still don’t understand why the bike won’t rev higher. I thought the lower 72/10 would make it rev deeper but all that did was shift to OD quicker.
Am I missing something. The fact that I’ve tried huge variations in gearing along with different driven settings leaves me at a loss. All I can fathom is the head work and mikuni are too much for the small cam....but I’m even doubting that.
I’ve heard of people having mystery problems with torque converters limiting speed. I have plenty of power so something is up. Oh, and slide is fully open. No issue there.
Thanks!
Build:
196 Hisun
Head shaved .070
Ported/polished
18lb springs
32 degrees timing on 3.1lb flywheel
Billet +.020 rod
Stock piston
Mikuni vm22
Staged Header
Upgraded msd wire
3910x plug
Cl1 cam
Rider+bike=260lbs
Tav 30 series, 6” driver with white springs, 3100 rpm engagement
19” tires.
Gearing- 50/8, 50/9, 72/10
I ran the engine first with 50/8. Driven on middle setting with green spring. Bike hit 41.x mph. Rpms were about 4800. I thought maybe I needed more gear to gain rpms. Switched to 72/10. Bike hit 5100 rpms, still showing 41mph, and did NOT feel as peppy. Switched to 3rd hole on driven...still same. Switched to 50/9 on 3rd hole. Bike felt peppy like it did on 50/8 but still 41mph.
Tried moving main jet up and down. Still 41-42mph.
Bike isles great, mid range is great, top end doesn’t break up and it isn’t excessively popping. Seems good.
What is preventing the bike from going faster? I know the cam is small and I have a lager 265 cam on order, but I still don’t understand why the bike won’t rev higher. I thought the lower 72/10 would make it rev deeper but all that did was shift to OD quicker.
Am I missing something. The fact that I’ve tried huge variations in gearing along with different driven settings leaves me at a loss. All I can fathom is the head work and mikuni are too much for the small cam....but I’m even doubting that.
I’ve heard of people having mystery problems with torque converters limiting speed. I have plenty of power so something is up. Oh, and slide is fully open. No issue there.
Thanks!